Toluene is a major air pollutant emitted from painting and metal coating processes and might have some health effects. Adsorption and catalytic complete oxidation are promising ways to retain or convert toluene into harmless products. The present work aims to develop a bifunctional material which can be used as an adsorbent and catalyst for low-temperature toluene removal. Copper zeolites were obtained by exchanging the sodium in the parent NaX zeolite with copper from aqueous solutions of Cu(NO3)2•2.5H2O. Several characterization techniques, H2-TPR, XPS, XRD and N2 physisorption, were used in order to evaluate the redox, surface, structural and textural properties of the materials, respectively. The various materials were tested in adsorption and catalytic processes. The sample with low copper content (1 wt. %) exhibited promising features in terms of toluene adsorption capacity and total oxidation. The results can be correlated to the presence of micropores and well-dispersed CuO species.
OPEN ACCESSCatalysts 2015, 5 1480
El presente artículo tiene como propósito desarrollar un análisis acerca del rol estratégico de la pequeña y mediana industria en el contexto del modelo desarrollo endógeno nacional. Basado en una investigación de tipo documental de contrastación teórica. Se identifican los elementos que determinan el papel fundamental de la pymi dentro de un modelo de desarrollo endógeno donde se definen dos estrategias a lo interno de cooperación entre los distintos niveles del entramado industrial nacional, y a lo externo una de competencia. Se concluye Las pymis cumplen un rol muy importante dentro de la economía de cualquier país por su capacidad para crear empleo, generadores y contribuyentes al ingreso nacional, además de contribuir a la democratización del capital y en consecuencia dentro de un esquema de desarrollo endógeno estas tienen un carácter estratégico en la conformación del entramado industrial.
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